Thermodynamic optimization of Portland cement clinkers for designing SCM-blended cements

초록

The composition of Portland cement clinker is crucial for determining the hydration and phase assemblages of blended cement systems incorporating supplementary cementitious materials (SCMs). This study investigates the influence of cement clinker compositions on the degree of reaction of fly ash and slag, and the phase evolution in blended systems. Thermodynamic modelling was employed to calculate the mineralogical compositions of clinkers from simulated raw materials and phase assemblages of blended cements, while the reaction degrees of SCMs were predicted using a machine learning model. The results indicate that a C3S content of approximately 57 % is optimal, as it maintains sufficient portlandite availability for SCM dissolution. Fly ash showed greater dependency on portlandite availability, whereas slag exhibited higher intrinsic reactivity even at lower C3S levels. These results highlight the impact of clinker composition and SCM replacement levels on hydration products, providing insights for optimizing cement formulations from production to hydration.

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